期刊
OPTICS LETTERS
卷 34, 期 21, 页码 3340-3342出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.34.003340
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资金
- National Natural Science Foundation of China [60476027, 60506016]
- 863 Program of China [2009AA03Z419]
- Collaborative Projects of NSFC-RFBR [60711120182, 60811120023]
The enhanced second-harmonic (SH) generation from Si (111) stripes induced by external cylindrical strain is investigated. The dependence of the intensity of the strain-induced SH on the sample azimuth shows that the Si under cylindrical strain has 3m symmetry, which is similar to that of the Si (111) surface. Further studies indicate that the intensity of the enhanced SH is a quadratic function of the cylindrical strain within the magnitude that the Si stripe can bear. For the p-polarized and s-polarized SH, the intensities are, respectively, enhanced by 47.9% and 13% at epsilon(0)=2.93 x 10(-4). The enhancement of SH is due to the contributions from the strain-induced second-order nonlinear susceptibility chi((2))(strain) to the bulk dipole. (C) 2009 Optical Society of America
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